Telescopic
Bolt.
The telescopic bolt, which encloses the barrel (200 mm Long) for
three quarters of its length, makes the firearm very compact and
reduces to a minimum the upward movement of the muzzle during
firing. The front grip, the magazine housing, the trigger guard
with firing device and manual and automatic safety devices are
all in a one piece assembly and are integral part of the receiver.
This gives solidity to the firearm and ensures good performance
over the years. Longitudinal grooves along the whole length of
the receiver allow excellent sliding of the bolt even in the extremely
adverse conditions (fall of the gun in mud and exposure to dust
and sand).

The
PM12 S2's sturdiness and its total reliability in different latitudes
can easily be seen in the general structure of the gun and in
the dimensions of its component parts, as also in the extreme
simplicity of design and assembly. The Beretta PM 12 S2 is a NATO
qualified sub machine gun for ammunition interchange ability test.

Telescopic
bolt

Manual
and Automatic Safety, Cocking Handle Safety.
The selector device allows for an easy selection of three positions,
namely: "manual safety" (S), "single shot”
(1), "full automatic fire" (R), without any need for
removing the hand from the grip. The automatic safety, which locks
the trigger and the bolt in its closed position, safeguards from
accidental firing if the gun is dropped and precludes firing if
the grip is not firmly held.
The safety on the cocking handle blocks the bolt in case this
is not fully retracted, thus preventing an accidental discharge.
The fixed firing pin can strike the primer only when the cartridge
is fully chambered, avoiding accidental firing, since the gun
fires from the "open bolt' position.

Precise,
Safe, Reliable.The front sight, adjustable in elevation and windage,
and rear sight with 100m or 200m flip aperture allow accurate aimed
fire and are well protected from impacts. The sturdy folding butt
can be safety locked in the "open" position. When folded,
the butt runs along the side of the receiver in the most practical
position. The exterior surfaces of the firearm, finished (after
phosphate treatment) with epoxy resin coating, guarantee the best
possible protection against corrosion and maximum resistance to
wear and abrasions.